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A171817 Primes p(n) such that neither p(n+-1) is prime of form 6k+1. 1
2, 3, 7, 13, 19, 43, 53, 97, 103, 109, 127, 139, 173, 181, 193, 229, 241, 257, 263, 283, 307, 313, 349, 397, 409, 421, 457, 463, 487, 499, 509, 563, 593, 643, 653, 691, 709, 769, 787, 811, 823, 829, 853, 859, 877, 883, 907, 919, 937, 947, 967, 977, 1021, 1051 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..54.

EXAMPLE

a(1)=2 because p(0)=not and p(2)=3 not are primes of form 6k+1, a(1)=3 because p(1)=2 and p(3)=5 not are primes of form 6k+1, a(2)=7 because p(3)=5 and p(5)=11 not are primes of form 6k+1.

CROSSREFS

Cf. A000040, A002476.

Sequence in context: A038940 A019383 A249749 * A156300 A067834 A070754

Adjacent sequences:  A171814 A171815 A171816 * A171818 A171819 A171820

KEYWORD

nonn

AUTHOR

Juri-Stepan Gerasimov, Dec 19 2009, Feb 11 2010

EXTENSIONS

Entries checked by R. J. Mathar, Apr 14 2010

STATUS

approved

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Last modified June 16 03:44 EDT 2019. Contains 324145 sequences. (Running on oeis4.)